I have finally caught a break in my search for a reason behind my family's numerous G2a matches along my maternal side in Relative Finder!

As last week or so found a cousin of my paternal aunt's whom had mtDNA G2a:

4th to Distant Cousin0.09% (7cM) shared1 segmentEstimated that your common ancestor was born before 1873.G2a R1b1b2a1a1*

After some correspondence i found out that his maternal line is infact Norwegian, his maternal ancestry comes from his Norwegian grandmother, whom came from Valders, which is in one of the few valleys that connect Western and Eastern Norway via a summer land route and have done so since the middle ages at least. My maternal ancestry is from the western side of this same region in the Aurland region, and it is also the same region that have been a traditional migration route for Norwegian Romani among others, and i think we are here seeing a weak support of the Romani/Tatar theory that goes something like this;

The Swedish king Charles XII after his extended stay inside the Ottoman empire following his catastrophic defeat at the hands of the Russian army, started recruiting mercenaries during his return to Sweden, and that this new army consisted of various ethnic groups, including Jews, Germans, Turks, Tatars, Romani ect, as accounted by among others, the Danish ambassador to Vienna whom is said to have witnessed them as they passed through this region going northwards to liberate Stralsund from the siege it was experiencing at the hands of a multinational army. The army returned to Sweden proper after the wars.

Another story, this from Estonia;

The Romani people first appeared to Estonia in the 17th century. According to rumors, they were first part of Swedish King Charles XII's Romani orchestra which he, after spending a winter in Laiuse, left behind.